fixed-vector

Generic vectors with statically known size.

LTS Haskell 23.27:1.2.3.0
Stackage Nightly 2025-07-12:2.0.0.0
Latest on Hackage:2.0.0.0

See all snapshots fixed-vector appears in

BSD-3-Clause licensed and maintained by Aleksey Khudyakov
This version can be pinned in stack with:fixed-vector-2.0.0.0@sha256:4a4249cd8446df269b8a817d5c2d48d4e31f2eb8530a7ab169c230232bf66892,4269

Module documentation for 2.0.0.0

Used by 1 package in nightly-2025-07-12(full list with versions):
fixed-vector-hetero

Generic library for vectors with statically known size. Implementation is based on http://unlines.wordpress.com/2010/11/15/generics-for-small-fixed-size-vectors/ Same functions could be used to work with both ADT based vector like . > data Vec3 a = a a a . Tuples are vectors too: . >>> sum (1,2,3) 6 . Vectors which are represented internally by arrays are provided by library. Both boxed and unboxed arrays are supported. . Library is structured as follows: . * Data.Vector.Fixed Generic API. It's suitable for both ADT-based vector like Complex and array-based ones. . * Data.Vector.Fixed.Cont Continuation based vectors. Internally all functions use them. . * Data.Vector.Fixed.Mutable Type classes for array-based implementation and API for working with mutable state. . * Data.Vector.Fixed.Unboxed Unboxed vectors. . * Data.Vector.Fixed.Boxed Boxed vector which can hold elements of any type. . * Data.Vector.Fixed.Storable Unboxed vectors of Storable types. . * Data.Vector.Fixed.Primitive Unboxed vectors based on pritimive package.

Changes

2.0.0.0 [2025.07.10]

  • Type family Dim returns Peano numbers instead of standard type level naturals.

    • Index type class restored and all indexing operation are performed in
    • Arity simplified
    • CVecPeano dropped and ContVec is parameterized using Peano numbers.

  • In ArityPeano type class methods reverseF and gunfoldF are replaced with more general accumPeano and reducePeano.

  • Unbox vector are fully reworked. All uses of data types with Unbox instances which are defined in the library except Bool should work without changes.

  • Data.Vector.Fixed.Cont.arity dropped.

  • Type of D.V.F.Cont.withFun generalized.

  • Type class VectorN dropped. Use QuantifiedConstraints instead.

  • Show instance now has form [...] instead of fromList [...].

  • ViaFixed newtype wrapper for deriving instances is added. StorableViaFixed is removed.

  • Data.Vector.Fixed.Storable.unsafeWith ensures that pointer won’t get GC’d while function runs.

  • Data.Vector.Fixed.sequenceA is deprecated in favor of sequence.

  • foldl' and ifoldl' functions added.

  • Implement sum as in terms of foldl'.

1.2.3.0 [2023-10-31]

  • Pattern V1 added
  • COMPLETE pragmas added for patterns V1,V2,V3,V4

1.2.2.1 [2022-12-29]

  • Newtype StorableViaFixed for deriving Storable instances added.

1.2.1.1 [2022-12-26]

  • Fixed bug in any (#18)

1.2.1.0 [2021-11-13]

  • Support for GHC7.10 dropped.
  • Pattern synonyms V2,V3,V4 added.
  • replicate{,M} and generate{,M} added.
  • Functions mk6, mk7, mk8 added.

1.2.0.0 [2018-09-02]

  • Show instance for data type now respect precedence.

1.1.0.0 [2018-03-11]

  • GHC8.4 compatibility release. Semigroup instances added and semigroup dependency added for GHC7.10

1.0.0.0 [2017-11-06]

  • Vector length now expressed as GHC’s type level literals. Underlying implementation still uses Peano numbers to perform induction. This doesn’t change user facing API much. Notably FlexibleInstances and GADTs/TypeFamiles are now required to write Arity constraint.
  • Monad constraint is relaxed to Applicative where applicable. Duplicate functions are removed (sequence & sequenceA → sequence, etc)
  • Module Data.Vector.Fixed.Monomorphic is dropped.
  • Construction of N-ary vectors reworked. Make type class is gone.
  • Boxed arrays now use SmallArrays internally.
  • overlaps is removed from API for mutable vectors.
  • Data.Vector.Fixed.defaultRnf is added.
  • Data.Vector.Fixed.Mutable.lengthI is dropped.

0.9.0.0 [2016-09-14]

  • Simplification of Arity type class. This change shouldn’t affect client code.
  • Support for GHC < 7.8 is droppped.
  • Fixed bug in any.

0.8.1.0 [2015-08-27]

  • find function added.

0.8.0.0 [2015-04-06]

  • NFData instances for all data type.
  • Storable instances for all data types and default implementation of Storable’s methods added.
  • {i,}zipWith3 and {i,}zipWithM_ added.

0.7.0.3 [2015-01-03]

  • GHC 7.10 support

0.7.0.0 [2014-08-15]

  • Type level addition for unary numbers added
  • concat function added
  • More consistent naming for functions for working with Fun

0.6.4.0 [2014-04-15]

  • Isomorphism between Peano numbers and Nat added. (GHC >= 7.8)

0.6.3.1 [2014-03-12]

  • Documentation fixes.

0.6.3.0 [2014-02-22]

  • Left scans added.

0.6.2.0 [2014-02-07]

  • Vec1 type synonym for boxed/unboxed/etc. vectors added.
  • Vector instance for Data.Typeable.Proxy (GHC >= 7.8)

0.6.1.1 [2014-02-04]

  • GHC 7.8 support

0.6.1.0 [2014-01-24]

  • distribute collect and their monadic variants added.

0.6.0.0 [2013-11-17]

  • Data instance for all array-based vectors added.
  • Storable instance added for Storable.Vec.
  • Monoid instances added for all vectors.

0.5.1.0 [2013-08-06]

  • Zero-element vector Empty'is added.

0.5.0.0 [2013-08-02]

  • ContVec now behaves like normal vector. Arity type class is reworked. Id data type is removed.
  • Construction of vector reworked.
  • reverse, snoc, consV, fold and foldMap are added.
  • Type changing maps and zips are added.
  • Vector indexing with type level numbers is added.
  • Twan van Laarhoven’s lens added. (element and elementTy)
  • Ord instances added to vector data types defined in the library.

0.4.4.0 [2013-06-13]

  • Functor and Applicative instances are added to Id.

0.4.3.0 [2013-05-18]

  • Typeable instance for S and Z added.

0.4.2.0 [2013-05-01]

  • 1-tuple Only added.
  • fromList' and fromListM added.
  • apply functions from Arity type class generalized.

0.4.1.0 [2013-04-29]

  • cons function added.
  • Getter for Fun data type added.

0.4.0.0 [2013-04-04]

  • Wrapper for monomorphics vectors is added.
  • VecList is reimplemented as GADT and constructors are exported.
  • Constructor of ContVecT is exported
  • Empty ContVecT is implemented as empty.
  • Typeable, Foldable and Traversable instances are added where appropriate

0.3.0.0 [2013-03-06]

  • Vector type class definition is moved to the D.V.F.Cont module.
  • Indexing function restored.
  • unfoldr added.

0.2.0.0 [2013-02-10]

  • Continuation-based vector added.
  • Right fold added.
  • tailWith, convertContinuation, and ! from Data.Vector.Fixed removed.
  • Vector instance for tuples added.

0.1.2 [2013-01-26]

  • imap, imapM, ifoldl, ifoldM, zipWithM, izipWithM functions are added.
  • VectorN type class added.

0.1.1 [2012-11-29]

  • foldM and tailWith added. Type synonyms for numbers up to 6 are added. Fun is reexported from Data.Vector.Fixed.